The atmospheric influence, size and possible asteroidal nature of the July 2009 Jupiter impactor - Orton, G; Fletcher, L; Lisse, C; Chodas, P; Cheng, A; Yanamandra-Fisher, P; Baines, K; Fisher, B; Wesley, A; Perez-Hoyos, S; de Pater, I; Hammel, H; et al. (ICARUS, 2011)